Angular offers a DatePipe that helps us display dates and times in various formats by converting the raw date value into a structured format using template expressions. Because each project or use case may require a specific date format, this pipe provides the flexibility needed to adapt to those needs effortlessly.
Syntax
{{ value_expression | date [ : format [ : timezone [ : locale ] ] ] }}
The DatePipe runs only when it detects a pure change in the input value. A pure change occurs when a primitive value is modified or when the object reference changes. Modifying a Date object does not trigger the pipe to re-render. To ensure the pipe executes, a new Date object must be created.
Predefined format options in Angular
| Option | Equivalent to | Examples (in en-US) |
|----|----|----|
| 'short' | 'M/d/yy, h:mm a' | 6/15/15, 9:03 AM |
| 'medium' | 'MMM d, y, h:mm:ss a' | Jun 15, 2015, 9:03:01 AM |
| 'long' | 'MMMM d, y, h:mm:ss a z' | June 15, 2015 at 9:03:01 AM GMT+1 |
| 'full' | 'EEEE, MMMM d, y, h:mm:ss a zzzz' | Monday, June 15, 2015 at 9:03:01 AM GMT+01:00 |
| 'shortDate' | 'M/d/yy' | 6/15/15 |
| 'mediumDate' | 'MMM d, y' | Jun 15, 2015 |
| 'fullDate' | 'EEEE, MMMM d, y' | Monday, June 15, 2015 |
| 'shortTime' | 'h:mm a' | 9:03 AM |
| 'mediumTime' | 'h:mm:ss a' | 9:03:01 AM |
| 'longTime' | 'h:mm:ss a z' | 9:03:01 AM GMT+1 |
| 'fullTime' | 'h:mm:ss a zzzz' | 9:03:01 AM GMT+01:00 |
Custom format options
We can also build a format string using symbols to define the components of a date-time.
Implementation
In this article, we created a simple project with a component called date-pipe-example, implemented various date formats, and tested the changes using Google Chrome developer tools.
Testing in different time zones with Chrome DevTools
Testing how dates display in different time zones and locale settings is common in web development. For this, we can leverage Chrome DevTools sensor tools, which allow simulating locations and time zone settings without needing to change system configuration.
Conclusion
In this article, we analyzed Angular's DatePipe and its flexibility for formatting dates and times. We built a component that displays different formats and explained how to use Google Chrome developer tools to test date display under different conditions.
For large-scale projects that handle multiple time zones and global users, properly managing dates and times is crucial for a smooth and reliable user experience. Angular facilitates this task with customizable formats and easy integration with different locale settings.
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